Electronics Forum | Mon Nov 12 18:08:37 EST 2007 | samir
That's when you give that "Supervisor" a tall glass of SHUT THE F*CK UP. I betcha you regret even mentioning it to him. I'd have just made up some techno-babble and switched it regardless. Told him something like - "pure IPA will act as a catlyst
Electronics Forum | Wed Nov 21 16:02:56 EST 2007 | muse95
We had some assemblers who were handy sewers, sew some pouches for us, for some extra cash on the side. One colour was chosen for a normal bench, a different colour for a leadfree bench kit. The pouches had lots of pockets. Then we populated it wi
Electronics Forum | Fri Nov 16 07:47:56 EST 2007 | realchunks
Stress cracks generally happen at wave solder, not reflow. But so you know, stress cracks from heat occur from the body and work towards the leads. They are generally circular. In the past, these cracks where blammed on the nozzle of the placement
Electronics Forum | Fri Nov 16 08:33:46 EST 2007 | rgduval
For RoHS assemblies, we're spec'ing at least FR-406 for the higher Tg. We're currently requesting our customers to use ENIG finish, as we've had better luck with assembly in our process; but we're currently experimenting wtih lead-free HASL. As far
Electronics Forum | Mon Nov 19 09:34:50 EST 2007 | bbarton
Real Chunks...Yes, that's the most glaringly obvious defect in the short term (you'll probably find it on your production floor if it's really bad) but you may find that everything looks good short term only to have a high level of customer returns..
Electronics Forum | Mon Nov 19 19:14:07 EST 2007 | jmelson
I've been running 90% lead-free (still have a couple components I can't get reliably in RoHS compliance) with a peak temp of about 238 C, on standard FR-4 boards. The only real problem is the pad adherence is compromised, making rework of the boards
Electronics Forum | Tue Nov 20 23:04:10 EST 2007 | wim
I am currently looking at selective solder > machines. The two that i have looked at are the > KIss 104 and the APS Novastar SP A400. Both > machines are in the price range i need to be in. > There are very different from each other as far > as
Electronics Forum | Tue Nov 27 19:41:53 EST 2007 | g2garyg2
Well, there seems to be many opinions, many of which could be correct, however... With the proper laser they can be quite good for soldering. Here are a few guidelines I would like to suggest. 1) Have your product soldered first (by the vendor) 2) T
Electronics Forum | Tue Nov 20 20:26:54 EST 2007 | davef
Peter: The above link to the the picture of the assembly is broken. Comments are: * Yes, RTV is completely useless for applications like you describe. Epoxy is a much better choice. * Dave G, in an archived thread on SMTnet, talks about using 3M Jet
Electronics Forum | Wed Nov 21 09:19:09 EST 2007 | Paul M.
Need some opinions from you fine folks. We are building assemblies 90% SMT, 10% TH. Fine pitch and BGA devices, etc. The customer is complaining about cold solder joints (SMT) after about 1 year of use, scattered thru-out the assembly, not consistan
